Since the best possible outcome is Hitler and the rest of his bully boys hanging by the neck...
Declare war on the United States on the First of December of 1940.
OR
Destroy the French will to fight by attacking and overwhelming the Maginot Line. Surprise the enemy by attacking no later than December 15, 1939.
OR
Send 18 divisions of infantry to assist your Japanese partners in June of 1939. Don't worry about sending tanks or aircraft. The Chinese are so backward that infantry is all you will need. The Heer's remaining troops are more than sufficient to defeat the Poles.
OR
Invade Russia, then declare war on the United States six months later. (Oops, he thought of this one on his own.)
Now IF I wanted the Reich to survive:
After France falls draft the designers of the Maginot Line, put 100% of Germany's construction resources to work building a defensive line starting at Danzig down to the Polish/Czech/Romanian border. Stop work on ALL naval construction and use the resources to build these defenses and arm them. Back up the line with tank heavy mobile forces. Pray that you can convince the UK and U.S. that you are a staunch anti-communist fighting the Red Menace.